O2COOL's 5-inch portable fan is perfect for indoor or outdoor activities, use in a hot office or at school, on a picnic and especially during a power outage. Our 5-inch fan is the perfect accessory. This fan runs at two speeds: high and low. It has an adjustable tilt for directional airflow. Its compact folding design for easy storage. The fan requires 2-D batteries (not included). Battery run time: 55 hours (low) and 30 hours (high).